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Immigration has largely been neglected as part of the study of International Political Economy (IPE) until recently. Currently, IPE scholars have focused on two questions regarding immigration: what explains variation in public opinion on immigration and what explains variation in immigration policy.

The scholarship on public opinion on immigration has largely been divided into two camps, those who argue that economic factors drive opinion and those who argue that cultural factors are the driver. Those who study the role economic factors have played in shaping opinion on immigration often start with the Stolper-Samuelson theorem. The Stolper-Samuelson theorem shows that while immigration increases the overall size of the economy, it has different distributional effects. Immigration increases the size of the labor pool and, thus, should increase the returns to capital while decreasing wages. As such, those who derive most of their income from capital should favor immigration while those who derive most of their income from wages should oppose immigration. Additionally, the Stolper-Samuelson model shows that openness to trade should have the same effects as open immigration; thus, people should oppose or favor both trade and immigration. Early scholarship examined these predictions and found that opposition to immigration was much higher than opposition to trade and that those who derive much of their income from capital also oppose immigration at high rates. In response, one set of scholars focused on the additional costs that immigration, but not trade, brings. Immigrants, unlike goods, may place a burden on the social welfare system and thus, opposition to immigration especially by the wealthy may be driven by these costs. Other scholars noted that immigrants work in many industries that are unaffected by trade—most notably the service sector—and this may explain opposition to immigration. Finally, a third group has argued that opposition to immigration is largely driven by cultural concerns and xenophobia. Currently, this debate continues with both sides examining more nuanced survey data.

Scholarship on immigration policy has similar divides. Immigration policy has become more restrictive since the late 19th and early 20th centuries, when most countries had very few restrictions on immigration. To explain these restrictions, one school of scholars has argued that labor unions oppose immigration, as it hurts the wages of their members. As unions gain strength, immigration should become more restricted. Others focus on the rise of the welfare state, arguing that immigration has been restricted to keep costs low. A third group has argued that greater political rights in the early and mid-20th century for the generally xenophobic working class has led to the restrictions. Finally, new scholarship argues that increased globalization—in the form of increased trade and increased foreign direct investment—has sapped business support for immigration, which has allowed anti-immigrant groups to have more say. Using a wealth of newly collected data, scholars are testing these different theories.

Department of Political Science, University of California, Los Angeles

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